Show +base

Conversion of values to readable Strings.
Minimal complete definition: showsPrec or show.
Derived instances of Show have the following properties, which are compatible with derived instances of Text.Read.Read:
* The result of show is a syntactically correct Haskell expression containing only constants, given the fixity declarations in force at the point constructor names defined in the data type, parentheses, and spaces. When labelled constructor fields are used, braces, commas, field names, and equal signs are also used.
* If the constructor is defined to be an infix operator, then showsPrec will produce infix applications of the constructor.
* the representation will be enclosed in parentheses if the precedence of the top-level constructor in x is less than d (associativity is ignored). Thus, if d is 0 then the result is never surrounded in parentheses; if d is 11 it is always surrounded in parentheses, unless it is an atomic expression.
* If the constructor is defined using record syntax, then show will produce the record-syntax form, with the fields given in the same order as the original declaration.
For example, given the declarations
> infixr 5 (:^:)
> data Tree a = Leaf a | Tree a (:^:) Tree a
the derived instance of Show is equivalent to
> instance (Show a) => Show (Tree a)
>
> showsPrec d (Leaf m) = showParen (d > app_prec) $
> showString "Leaf " . showsPrec (app_prec+1) m
>
>
> showsPrec d (u (:^:) v) = showParen (d > up_prec) $
> showsPrec (up_prec+1) u .
> showString " (:^:) " .
> showsPrec (up_prec+1) v
>
Note that right-associativity of :^: is ignored. For example,
* show (Leaf 1 (:^:) Leaf 2 (:^:) Leaf 3) produces the string "Leaf 1 (:^:) (Leaf 2 (:^:) Leaf 3)".

Show a signed RealFloat value using scientific (exponential) notation (e.g. 2.45e2, 1.5e-3).
In the call showEFloat digs val, if digs is Nothing, the value is shown to full precision; if digs is Just d, then at most d digits after the decimal point are shown.

Show a signed RealFloat value using standard decimal notation (e.g. 245000, 0.0015).
In the call showFFloat digs val, if digs is Nothing, the value is shown to full precision; if digs is Just d, then at most d digits after the decimal point are shown.

Show a signed RealFloat value using standard decimal notation for arguments whose absolute value lies between 0.1 and 9,999,999, and scientific notation otherwise.
In the call showGFloat digs val, if digs is Nothing, the value is shown to full precision; if digs is Just d, then at most d digits after the decimal point are shown.